Change due date confirmation page is blank.

In the bugfest environment, when I change the due date from the loan detail record screen of the User by clicking the "Change due date" tab at the top of the page, I expect to get an acknowledgement screen that tells me the due date has been changed and to what.

Actual behavior: Acknowledgement screen is blank. Seescreenshot. HOWEVER, the due date has been changed.

The same thing happens when I select Change due date from the ellipsis dropdown. I see a flash of the full form, then it resolves to the acknowledgement screen as pictured. The due date IS changed.